Summary: Transient anomaly imaging by the acoustic
radiation force
Habib Ammari
Pierre Garapon
Lili Guadarrama Bustos
Hyeonbae Kang
Abstract
This paper is devoted to provide a solid mathematical foundation for a
promising imaging technique based on the acoustic radiation force, which acts
as a dipolar source. From the rigorously established asymptotic expansions
of near- and far-field measurements of the transient wave induced by the
anomaly, we design asymptotic imaging methods leading to a quantitative
estimation of physical and geometrical parameters of the anomaly.
1 Introduction
An interesting approach to assessing elasticity is to use the acoustic radiation force
of an ultrasonic focused beam to remotely generate mechanical vibrations in organs
[23]. The acoustic force is generated by the momentum transfer from the acoustic
wave to the medium. The radiation force essentially acts as a dipolar source. A
spatio-temporal sequence of the propagation of the induced transient wave can be
acquired, leading to a quantitative estimation of the viscoelastic parameters of the